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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997b46be7e655b8b1e5341156ca3ceccf618b7cff588865b3eecac747fa7fb1c' 
  AND token = 'UXgMkNDBPwhb6WXFe20Oh+oxQj1FrcS493nL36x+ueM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}